If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below.
Please be aware that this is a community forum. Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Thus, Holley can not guarantee an answer or timing on an answer.

SNIPER N2O Kit with SNIPER EFI. Jetting size conversion help needed.

Recently installed a Sniper EFI setup on my car, and also have a Sniper nitrous kit that I'd like to use with it. The Sniper plate kit is originally for the 4150 carb. P/N A7001-SNOS. I run a Tanks Inc. in-tank EFI pump, which works great with the EFI setup. I originally had considered using a low pressure regulator, to lower fuel pressure before the fuel solenoid, relying on the EFI return to allow adequate fuel return, as it does now. I've found that I can use the plate with high pressure fuel, but need to know what the conversion rate is to do so.

47 Nitrous/53 Fuel is what NOS suggests for a 100 HP jetting for carb. What jet would I need for fuel, with 58.5 psi of fuel pressure, to reach the same 100 HP rating? Or how can I find and/or use the formula to tell me? I'm going to eventually up the nitrous to 150 HP, or even 175 HP if possible, FWIW.

Posting Permissions

About us

Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.